Database of Zeolite Structures
 

Framework Type VSV
Type Material
  Material Name: VPI-7    
 
Chemical Formula§:
 
|Na+26H+6 (H2O)44| [Zn16Si56 O144]-VSV
 
   
Unit Cell§:
 
orthorhombic

 F d d 2 (# 43)
    a' = 39.8800Å b' = 10.3260Å c' = 10.2190Å  
    α' = 90.000 ° β' = 90.000° γ' = 90.000°  
(Relationship to unit cell of Framework Type: a' = c, b' = a · sqrt(2), c' = b · sqrt(2)
or, as vectors, a' = c , b' = b - a, c' = a + b)
   
Framework density:
 
17.1 T/1000 Å3
 
 
Channels:
 
[01-1] 9 3.3 x 4.3* <-> [011] 9 2.9 x 4.2*<-> [011] 8 2.1 x 2.7*
Dimensionality
  Sorption (molecular cross section > 3.4Å): 0-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
   
References:
  Annen, M.J., Davis, M.E., Higgins, J.B. and Schlenker, J.L.
   "VPI-7 - The 1st Zincosilicate Molecular Sieve Containing 3-Membered T-Atom Rings"
   Chem. Commun., , 1175-1176 (1991)
  § Rhrig, C., Gies, H. and Marler, B.
   "Rietveld refinement of the crystal structure of the synthetic porous zincosilicate VPI-7"
   Zeolites, 14, 498-503 (1994)
 
 
Name and Code derivation:
    Virgina Polytechnic Institute - seven
  VPI-7 (seven)
  VSV
 
§ Chemical Formula and Unit Cell taken from the reference marked with this sign
Limiting Rings
 
9-ring along [01-1]

9-ring along [011]

8-ring along [011]

8-ring viewed along [100]